Style snails
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| Goniodorididae | ||||||||||||
| Lovén , 1846 |
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The folding screw or stylus screw ( Goniodorididae ) are a family of slugs in the subordination of nudibranchs . They are mostly small, exclusively marine shellless snails that feed on different sessile animals depending on the species .
features
The Goniodorididae have a narrow, often with simple appendages ("stylus") provided back hem on the head and the flanks, which is almost completely absent in some species, with appendages instead. The two antennae on the head, the rhinophores , are laminated, especially in the genus Okenia but only on the back. The gills around the anus on the back cannot be retracted.
The snails have a very narrow radula with large hook-shaped inner posterior teeth and plate-shaped marginal teeth. Jaws are missing. A goiter is located dorsally on the pharynx, with the help of which food can be sucked in.
While snails of the genus Trapania from Kamptozoen feed, feeding members of the genus Goniodoris sea squirts , and in the genus Okenia are the prey bryozoans , both soft Ctenostomata and hard, chalky Cheilostomata . The meat is grated with the radula.
Like other star snails, the Goniodorididae are hermaphrodites and mate with each other. They lay their eggs in translucent egg strings from which numerous Veliger larvae hatch, feed on plankton and, after a long pelagic phase, metamorphose into small star snails .
The Goniodorididae include the white style snail ( Ancula gibbosa ) and the white-transparent goniodoris ( Goniodoris nodosa ).
Systematics
According to Bouchet and Rocroi (2005), the Goniodorididae family is one of three families in the superfamily Onchidoridoidea . Seven genera belong to the family:
- Ancula Lovén, 1846
- Goniodoris Forbes & Goodsir, 1939
- Goniodoridella Pruvot-Fol, 1933 - only species: Goniodoridella savignyi Pruvot-Fol, 1933
- Lophodoris GO Sars, 1878
- Murphydoris Sigurdsson, 1991
- Okenia Menke, 1830 - Synonyms: Idalia Leuckart, 1828; Idaliella Bergh, 1881; Idalina Norman, 1890; Cargoa Vogel & Schultz, 1970; Ceratodoris Gray, 1850; Hopkinsia MacFarland, 1905; Sakishimaia Hamatani, 2001; Teshia Edmunds, 1966
- Trapania Pruvot-Fol, 1931
literature
- Luise Schmekel, Adolf Portmann: Opisthobranchia of the Mediterranean: Nudibranchia and Saccoglossa . Springer-Verlag, Berlin Heidelberg New York 1982. Goniodorididae Gray, 1854 : p. 125.
- Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN 0076-2997
Web links
Individual evidence
- ↑ WB Rudman (2004): Further species of the opisthobranch genus Okenia (Nudibranchia: Goniodorididae) from the Indo-West Pacific (PDF file; 3.67 MB) . Zootaxa 695. pp. 4f.
- ^ World Register of Marine Species , Goniodorididae H. Adams & A. Adams, 1854
- ↑ Goniodorididae in the Integrated Taxonomic Information System (ITIS)
- ^ P. Bouchet (2010), World Register of Marine Species : Ceratodoris Gray, 1850
- ↑ TM Gosliner (2004): Phylogenetic Systematics of Okenia , Sakishmaia , Hopkinsiella and Hopkinsia (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific. Proceedings of the California Academy of Sciences 55 (5), pp. 125-161. PDF .
- ↑ P. Bouchet, S. Gofas (2010), World Register of Marine Species : Okenia Menke, 1830